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TECHNICAL GUIDE Cal. 7T62A/7T92A/7T94A
III. REMARKS ON DISASSEMBLING AND REASSEMBLING
• Caution for disassembling
• How to install
● Hands
● Dial
• Caution for disassembling
1 Pin for date dial guard
• How to remove • How to install
1. Turn the pin 90-degree counterclockwise toloosen the pin
using a screwdriver.
2. Pick up the pin using rodico.
1. Set the pin securely into the groove.
2. Turn the pin 90-degree clockwise to fix thepin using a
screwdriver.
Notes:
* Do not turn the pin more than 90-degree in either direction.
Take care so as not to break the plasticparts.
* Do not turn the pin forcibly.
* Use a screwdriver of an appropriate size .
The hour wheel is made of engineering plastics. When pulling out
the hour hand, take care not todamage the hour wheel.
1) Pull out the crown with winding stem to the second click.
Then, turn the crown clockwise to turnthe time hands also
clockwise.
2) Stop turning the crown when the date changes to the next.
3) 7T62: Install the stopwatch minute hand, alarm hour and
minute hands so that they point exactlyto the 12 o’clock
position.
7T92: Install the stopwatch 1/20-second hand, stopwatch hour and
minute hands so that theypoint exactly to the “0” position.
7T94: Install stopwatch minute hand so that it points exactly to
the “0” position.
4) Install the small second, hour and minute hands so that they
point exactly to the 12 o’clockposition.
5) Install the stopwatch hand so that it points exactly to the
“0” position of the stopwatch scale.
* After installing the hands, be sure to check that they move
smoothly without interfering with oneanother.
When disassembling the dial, take care not to bend the dial leg.
Raise the portions around the diallegs by turns gradually to remove
the dial.
rodico
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TECHNICAL GUIDE Cal. 7T62A/7T92A/7T94A
Date jumper
• Lubricating
After installing the pins for date dial guard, lubricate the
wheel edge of both the date driving wheel anddate dial.
AO-3 (or MS-A)
8 Hour wheel
When installing the hour wheel, check that it engages with the
pinion of the minute wheel.
10 Battery clamp
When installing the battery clamp, set it securely to the two
hooking portions of the movement.
Protruded portion
Guide post
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15/27
TECHNICAL GUIDE Cal. 7T62A/7T92A/7T94A
13 Circuit block cover
Screw
• How to remove
1) Loosen the four circuit block cover screws.
2) Release the four hooking portions of the circuit block cover
(indicated by the arrows in theillustration below.)
Screw
Screw
“b” portion
“a” portion
• How to install
1) Have the four hooking portions of the circuit block cover
(indicated by the arrows in the illustrationbelow) catch the
movement securely. In doing so, check if the circuit block is set
properly to guideposts “a” and “b”, and reset it in position if
necessary.
2) Tighten the four circuit block cover screws. When tightening
the screws, take care not to cut the coil.
14 Friction spring for second counting
• Setting position
To set the friction spring for second counting,slip it into the
gap under the train wheelbridge.
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TECHNICAL GUIDE Cal. 7T62A/7T92A/7T94A
a
b
c
d
e
15 Circuit block
• Caution for disassembling
• How to install
The circuit block is fixed to the train wheel bridge with the
guide pins (“a”,“b”,“c”,“d” and “e” inthe illustration shown
below). When removing the circuit block from the guide pins, take
care notto damage the circuit block.
Have the guide holes of the circuit block (“a”,“b”,“c”,“d” and
“e” portions in the illustration)securely caught by the guide pins
of the train wheel bridge and the guide tubes of the main
plate.
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TECHNICAL GUIDE Cal. 7T62A/7T92A/7T94A
19 Train wheel bridge
• How to install
AO-3 (or MS-A)
AO-2 (or MS-F)
18 Pin for train wheel bridge
• How to remove
Turn the pin 90 degrees counterclockwise with a screwdriver to
loosen it.
• How to install
Pin for train wheel bridge
• Lubricating
After installing the pin, lubricate the upper pivot of the parts
as indicated in the table below.
CAL. 7T62A
CAL. 7T92A
CAL. 7T94A
Minute wheelSmall second wheelMinute counting wheel Center wheel
for alarmSecond counting wheel
Minute wheelSmall second wheelSecond counting wheel (1/20)Second
counting wheel
Minute wheelSmall second wheelMinute counting wheel
AO-3 (or MS-A)
Chronograph rotor for secondChronograph rotor for minuteAlarm
rotor Step rotor
Chronograph rotor for second (1/20)Chronograph rotor for
secondChronograph rotor for minute Step rotor
Chronograph rotor for secondChronograph rotor for minuteStep
rotor
AO-2 (or MS-F)
Set the pin in the direction as shown below. Then, turn it 90
degrees clockwise with a screwdriverto fix it.
Before installing the train wheel bridge, carefully check the
setting positions of the wheels androtors. Be sure to check that
each rotor has a lower pivot attached securely.
If the wheels and rotors are all set in position with the
winding stem with crown at the first click,the train wheel bridge
can be installed smoothly. There is no need to press down the train
wheelbridge.
If the train wheel bridge will not be seated in position
smoothly, the other parts must be set in thewrong position. Check
their setting positions.
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TECHNICAL GUIDE Cal. 7T62A/7T92A/7T94A
● Wheels and pinions
Notes:
1.
CAL. 7T62A:
Intermediate minute counting wheel and intermediate alarm wheel
can be used interchangeably.
CAL. 7T92A:
Intermediate wheel for second counting (1/20) and intermediate
minute counting wheel can be usedinterchangerably.
2. The following rotors for each caliber can be used
interchangeably:
CAL. 7T62A
• Chronograph rotor for second (1/5)
• Chronograph rotor for minute
• Alarm rotor
• Step rotor
CAL. 7T92A
• Chronograph rotor for second (1/20)
• Chronograph rotor for second
• Chronograph rotor for minute
• Step rotor
CAL. 7T94A
• Chronograph rotor for second (1/5)
• Chronograph rotor for minute
• Step rotor
• Setting position
See the illustration on the next page.
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19/27
TECHNICAL GUIDE Cal. 7T62A/7T92A/7T94A
The illustrations refer only to Cal. 7T62A & 7T94A.
27 0261 580Minute wheel
20 0888 582Second counting wheel
44 0281 580Setting wheel
47 4283 581Spacer for centerwheel & pinion
40 4146 710Chronograph rotor forminute
26 0885 591Second intermediatewheel for secondcounting
28 0950 590In termedia te minutecounting wheel
39 4146 710Chronograph rotor forsecond
25 0885 590First intermediate wheelfor second counting
21 0240 580Small second wheel
24 0701 580Fifth wheel & pinion
38 4146 710Step rotor
22 0241 583Fourth wheel & pinion
23 0231 580Third wheel & pinion
32 0261 582Minute wheel for alarm
30 0950 590 Intermediate alarm wheel
31 0270 582 Center wheel for alarm
29 0902 580Minute counting wheel
37 4146 710Alarm rotor
0240 582 Small second wheel
0817 508 Intermediatesmall second wheel
21a 21b
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20/27
TECHNICAL GUIDE Cal. 7T62A/7T92A/7T94A
The illustrations refer only to Cal. 7T92A.
23 0231 580Third wheel & pinion
22 0241 583Fourth wheel & pinion
31 0270 582Minute counting wheel
27 0261 580Minute wheel
20 0888 582Second counting wheel
30 0950 590In te rmed ia te minutecounting wheel
32 0261 582Intermediate wheel forhour counting
28 0950 590Intermediate wheel forsecond counting (1/20)
25 0885 594First intermediate wheelfor second counting
21 0240 580Small second wheel
39 4146 710Chronograph rotor forsecond
44 0281 580Setting wheel
38 4146 710Step rotor
40 4146 710Chronograph rotor forsecond (1/20)
47 4283 581Spacer for center wheel& pinion
29 0902 580Second counting wheel(1/20)
26 0885 595Second intermediatewheel for secondcounting
37 4146 710Chronograph rotor forminute
24 0701 580Fifth wheel & pinion
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21/27
TECHNICAL GUIDE Cal. 7T62A/7T92A/7T94A
• Setting position and lubricating
41 Switch lever (A)
42 Setting lever
43 Yoke
49 Train wheel setting lever
48 Center wheel and pinion
45 Winding stem
Train wheel setting lever
Yoke
Setting lever
Switch lever (A)
AO-3 (or MS-A)
SEIKO Watch Oil S-6
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22/27
TECHNICAL GUIDE Cal. 7T62A/7T92A/7T94A
55 Main plate
AO-3 (or MS-A)
AO-2 (or MS-F)
SEIKO Watch Oil S-6
• Lubricating
Switch lever axle for switch lever (B)
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23/27
TECHNICAL GUIDE Cal. 7T62A/7T92A/7T94A
● Coil block resistance
IV. VALUE CHECKING
Coil block (A)
Coil block for chronograph second
Coil block for chronograph minute (Cal. 7T62A)
Coil block for second counting (1/20) (Cal. 7T92A)
Coil block for alarm (Cal. 7T62A)
Coil block for chronograph (Cal. 7T92A)
1.70 KW ~ 2.60 KW
1.70 KW ~ 2.60 KW
1.80 KW ~ 2.40 KW
1.80 KW ~ 2.40 KW
● Upconverter coil resistance : 150 W ~ 180 W
● Current consumption
When measuring the current consumption with SEIKO Multi-Tester
S-860,select the measurement range as follows:
Less than 1.10 m A (with 1.55 V supplied from a battery)
(when the stopwatch is not used)
Less than 0.20 m A (with 1.55 V supplied from a battery)
For the whole movement
For the circuit block alone
Use the range of 40 m A of SUPPLY V (= 1.55 V) & GATE TIME
(2 S)For the whole movement
For the circuit block alone Use the range of 4 m A of SUPPLY V
(= 1.55 V) & GATE TIME (2 S)
V. FUNCTION CHECKING
Follow the procedure in “II. NECESSARY PROCEDURE AFTER BATTERY
CHANGE” to set thetime hands and reset the stopwatch hands to the
“0” position.
* Before checking the stopwatch function, reset the stopwatch
hands to the “0” positionfollowing the procedure in “II. NECESSARY
PROCEDURE AFTER BATTERY CHANGE.”
* Check that the crown is at the normal position. If not, the
stopwatch operation cannot be made.
● TIME SETTING AND STOPWATCH HAND POSITION ADJUSTMENT
● STOPWATCH FUNCTION
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TECHNICAL GUIDE Cal. 7T62A/7T92A/7T94A
CAL. 7T62A CAL. 7T92A CAL. 7T94A
2. Checking for Split Time Measurement
Press to start the measurement.
A
A
B
Press repeatedly to checkif the stopwatch 1/5second hand starts
andstops with each press.
Press to check if all thestopwatch hands returnto the “0”
position.
Check if the stopwatchminute hand s tar tsm o v i n g a s t h
eaccumulated elapsedtime exceeds one minute.
P r e s s t o s t o p t h emeasurement.
A
A
A
A
A
B
Press repeatedly to checkif the stopwatch 1/20second hand starts
andstops with each press.
Press to check if all thestopwatch hands returnto the “0”
position.
Check if the stopwatchhour and minute handsstart moving as
theaccumulated elapsedtime exceeds one minute.
P r e s s t o s t o p t h emeasurement.
B
A
B
B
B
A
B
B
1. Checking for Standard Measurement/Accumulated Elapsed Time
Measurement
Press repeatedly to checkif the stopwatch 1/5second hand starts
andstops with each press.
Press to check if all thestopwatch hands returnto the “0”
position.
Check if the stopwatchminute hand s tar tsm o v i n g a s t h
eaccumulated elapsedtime exceeds one minute.
P r e s s t o s t o p t h emeasurement.
Press to check if the stopwatch hands stop to indicate the split
time.
Press to check if the hands move quickly to indicate the elapsed
time and restart the measurement.
Press repeatedly to check if the split time is measured and
released with each press.
Press to stop the measurement.
Press to check if all the stopwatch hands return to the “0”
position.
Note for the stopwatch 1/20 second hand for Cal. 7T92A:
* After the stopwatch is started, the stopwatch 1/20-second hand
automatically stops and stays at the “0”position if the measurement
exceeds 10 minutes. When the measurement is stopped or split time
ismeasured, it moves to indicate the elapsed 1/20 seconds.
Also, after the stopwatch is restarted or split time is
released, the stopwatch 1/20-second handautomatically stops and
stays at the “0” position if the measurement exceeds another 10
minutes.
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TECHNICAL GUIDE Cal. 7T62A/7T92A/7T94A
❖ To Set the Alarm TimePull out to the 1st click.
Press repeatedly to set the alarm hands to the desired alarm
time.
* With each press, they move by one minute. They move quickly if
the button is kept pressed. They stop whenthey reach the current
time. Release and press the button, and the hands will start moving
again.
* The single-time alarm cannot be set for a time more than 12
hours ahead of the current time.
❖ To Readjust the Designated Alarm Time
Pull out to the 1st click.CROWN
Press repeatedly to set the alarm hands to the desired alarm
time.
Push back in to the normal position.CROWN
B
B
CROWN
CROWN Push back in to the normal position.
• Before checking the alarm function, set the time and alarm
hands to the current time following theprocedure in “II. NECESSARY
PROCEDURE AFTER BATTERY CHANGE.”
● ALARM FUNCTION (Only for Cal. 7T62A)
▼
* At the designated alarm time, the alarm rings for 20 seconds
and stops. To stop it manually, press button “A”or “B”.
* After the alarm rings, the alarm minute hand starts moving at
one-minute intervals, then the alarm hands indicatethe current
time.
▼
▼
▼
❖ To Cancel the Alarm
Pull out to the 1st click.CROWN
Press repeatedly to set the alarm hands to the current time.
Push back in to the normal position.CROWN
B
▼
▼
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TECHNICAL GUIDE Cal. 7T62A/7T92A/7T94A
Movement
VI. TROUBLESHOOTING
T h e w a t c h s t o p soperating.
The battery has been depleted. Measure the battery
voltage.Replace the battery with a newone.
The hour wheel and the pinionof the minute wheel are notproperly
engaged. (Or the teethof the hour wheel and/or minutewheel has been
broken.)
Check the relevant parts, andreplace the damaged parts withnew
ones.
The hooking portions of thecircuit block cover are notproperly
engaged, resulting inpoor conductivity.
Securely attach the hooks ofthe circuit block cover to themain
plate.
The coil is broken. Measure the co i l b lockresistance. Replace
the coil witha new one.
One or more wheels have beencontaminated with dirt, dust orother
particles.An excessive amount of oil inthe movement has
causedadhesive forces among theparts. (wringing)
Remove dirt or dust and cleanthe contaminated wheels. Becareful
so as not to damage theteeth of the plastic parts
whilecleaning.
The current consumptionfor the whole movementexceeds the
standardvalue.
Check the rotat ion andengagement of the date dial.Bend the date
dial downwardto adjust the clearance. Orreplace the date dial with
a newone.
Dirt, dust or foreign particlesare adhered to the movement.
Remove dirt, dust or foreignpar t i c les and c lean
themovement.
The driving pulse is generatedin order to compensate
theexcessive load applied to thewheels. (The oil is
deteriorated,leaked or ran out.)
If the current consumption forthe circuit block alone is
withinthe standard value range,overhaul and c lean themovement
parts, and thenmake the measurement again.
The current consumptionfor the circuit block aloneexceeds the
standardvalue.
The light from outside themovement is affecting
themeasurement.
Shut out the light, and make themeasurement again.
There is a defect in the IC(integrated circuit).
Replace the circuit block with anew one.
The date dial shows anabnormal movement.
The date dial has becomeimproperly engaged with thed a t e d r i
v i n g w h e e l o rdisengaged from the datedriving wheel.
The date does notchange.
T h e d a t e j u m p e r h a sdisengaged.
Symptom Possible causes Solutions
The date dial does notmove.
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TECHNICAL GUIDE Cal. 7T62A/7T92A/7T94A
©2002-2006 by
Stopwatch/Alarm
One or more hands ofthe stopwatch or alarmhave stopped moving
orshow an abnormalmovement.
The relevant coil is broken. Measure the co i l b
lockresistance. Replace the coil witha new one if necessary.
The excessive load is beingapplied to the chronographwheels due
to dust or foreignparticles adhered to them or oilstarvation.
Clean the relevant parts andlubricate with an adequateamount of
oil.
The step motor showsan abnormal movement.
There is a crack on the circuitblock switch pattern.
Replace the circuit block with anew one.
The buttons do notoperate normally.
The amount of oil around thebuttons is insufficient.
Clean the buttons and lubricateappropriately.
The circuit block pattern hasbeen broken or bended.
Adjust the circuit block patternor replace the circuit block
witha new one.
The alarm does notsound. (For 7T62A only)
The Piezoelectric element isbroken or out of alignment.
The upconverter coil is broken. Replace the circuit block with
anew one.
The alarm sound is toosmall. (For 7T62A only)
The crown falls off. The winding stem is not securelyinstalled.
(The setting lever andyoke are disengaged.)
Check the main plate, windingstem, setting lever and
yoke.Replace the defective parts withnew ones.
The current consumptionexceeds the standardvalue.
The excessive load is beingapplied due to frictions amongt h e h
o u r , m i n u t e a n dchronograph hands.
Small amount of water/blur inside of the glasspersists.
Water resistance is deteriorated.The watch has been subjectedto
water pressure that exceedsthe guaranteed degree.
Investigate the causes to takenecessary measures, whilecleaning
inside of the watch.
Remount the piezoelectricelement or replace it with a
newone.
Replace the stator with a newone.
Adjust or remount the relevanthands.
Symptom Possible causes Solutions
Exteriorparts
The step motor has beendiformed.